Suppose the state department of real estate conducts a study of the number of first-time applicants who are successful in passing the state certification examinationfor real estate salespeople on their first attempt...
What is the sample proportion of real estate employees who passed the exam on their first attempt?
a. 0.26
In the past, 38% of all students pass the state high school exam on their first try. A school posts a first time passing rate of 56%. If the school had a sample size of 324, is the school's 56% really any different that the state's 38%?
Please solve the following problem:
Scores on an examination are assumes to be normally distributed with mean 78 and variance 36.
a.What is the probability that a person taking the examination scores higher than 72?
b.Suppose that students scoring in the top 10% of this distribution are to receive an A grade. What is th
1) SafeRoad Stores is redesigning the checkout lanes in its stores throughout the country. Two designs have been suggested. Tests on customer checkout times have been conducted at two stores where the two new systems have been installed. A summary of the sample data follows:
System A System B
Sample size
A sample of scores on an examination given to both males and females is:
Males 72, 69, 98, 66, 85, 76, 79, 80, and 77
Females 81, 67, 90, 78, 81, 80, and 76
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
1. A random sample of size 81 is taken from a large population, measuring the time it takes to complete a driver's license examination. The sample mean was found to be 43 minutes, and the sample standard deviation 5.71 minutes. Construct a 95% confidence interval around the sample mean. Be sure to show whether you use the t- or
Need help setting up, understanding and solving this problem:
At Western University the historical mean of scholarship examination scores for freshman applications is 900. A historical population standard deviation σ = 180 is assumed known. Each year, the assistant dean uses a sample of applications to determine whether
Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
If the score of an individual is randomly selected, find the probability that the score will be less than 90.0.
If a random sample of size n = 20 is selected, find the probability that the sample mean
1. Consider a multiple choice examination with 50 questions. Each question has four possible answers. Assume that a student who has done the homework and attended lectures has a 75% probability of answering any question correctly.
a) A student must answer 43 or more questions correctly to obtain a grade A. What percentage
